The PENTAIR RESIDENTIAL FILTRATION ECP5-20BB Pleated Cellulose-Polyester filter is designed for high-efficiency water filtration. This filter features a pleated design that maximizes surface area, allowing for superior dirt-holding capacity and extended service life. Made from a blend of cellulose and polyester, it effectively captures sediment and contaminants, ensuring cleaner water for your home. Compatible with Big Blue filter housings, this filter meets industry standards for quality and performance, making it an essential component for effective residential water treatment.